Mughīrah
No. Mughīrah is not a Qur'anic proper name; it is a classical Arabic word and a historically attested personal name among early Muslims, notably a Companion.
Yes. The name appears in early Islamic biographical literature; for example Mughīrah ibn Shuʿbah is recorded among the Companions (Sahābah).
Yes, but it is rare and carries a martial sense. Families often choose it for its historical association; some may prefer softer meanings depending on personal preference.
It derives from Arabic verbal patterns linked to gh-r/ghāra-type roots denoting sallying or attacking; the pattern yields the agentive meaning 'one who attacks/raids.'
Classical forms may appear with different endings in texts, but Mughīrah as attested historically is a masculine name. Feminine adaptations are uncommon in classical records.